diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f7e2eab..e61e9b1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,16 +27,12 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install poetry
+          python -m pip install --upgrade poetry
           poetry config virtualenvs.create false
           poetry install -v
+          poetry install -E extra
           # reinstall pandas to specific version
           pip install $JINJA2
-          pip install regex
-          pip install markdown
-          pip install python-dateutil
-          pip install python-frontmatter
-          pip install python-slugify
         env:
           JINJA2: ${{ matrix.jinja2 }}
       - name: Test with pytest
diff --git a/.gitignore b/.gitignore
index 9c49229..0dbd423 100644
--- a/.gitignore
+++ b/.gitignore
@@ -107,7 +107,7 @@ venv.bak/
 # mypy
 .mypy_cache/
 
-poetry.lock
+# poetry.lock
 
 # tagit backup files
 *.bak
diff --git a/docs/changelog.md b/docs/changelog.md
index c1eb731..ec08831 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,3 +1,8 @@
+# 0.7.4
+
+- ✅ Add tests regarding #47
+- 📌 Upgrade and pin dependencies
+
 # 0.7.3
 
 - 🩹 Make `default` filter work with `None`
diff --git a/liquid/__init__.py b/liquid/__init__.py
index a19c29b..1ffeb96 100644
--- a/liquid/__init__.py
+++ b/liquid/__init__.py
@@ -4,4 +4,4 @@
 
 patch_jinja()
 
-__version__ = "0.7.3"
+__version__ = "0.7.4"
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..f2d7319
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,608 @@
+[[package]]
+name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "attrs"
+version = "21.4.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "cloudpickle"]
+
+[[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "coverage"
+version = "6.2"
+description = "Code coverage measurement for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+tomli = {version = "*", optional = true, markers = "extra == \"toml\""}
+
+[package.extras]
+toml = ["tomli"]
+
+[[package]]
+name = "importlib-metadata"
+version = "4.8.3"
+description = "Read metadata from Python packages"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+perf = ["ipython"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+
+[[package]]
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "jinja2"
+version = "3.0.3"
+description = "A very fast and expressive template engine."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+MarkupSafe = ">=2.0"
+
+[package.extras]
+i18n = ["Babel (>=2.7)"]
+
+[[package]]
+name = "markdown"
+version = "3.3.6"
+description = "Python implementation of Markdown."
+category = "main"
+optional = true
+python-versions = ">=3.6"
+
+[package.dependencies]
+importlib-metadata = {version = ">=4.4", markers = "python_version < \"3.10\""}
+
+[package.extras]
+testing = ["coverage", "pyyaml"]
+
+[[package]]
+name = "markupsafe"
+version = "2.0.1"
+description = "Safely add untrusted strings to HTML/XML markup."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "packaging"
+version = "21.3"
+description = "Core utilities for Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
+
+[[package]]
+name = "pluggy"
+version = "1.0.0"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
+[[package]]
+name = "py"
+version = "1.11.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "pyparsing"
+version = "3.0.7"
+description = "Python parsing module"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+diagrams = ["jinja2", "railroad-diagrams"]
+
+[[package]]
+name = "pytest"
+version = "7.0.1"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+py = ">=1.8.2"
+tomli = ">=1.0.0"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+
+[[package]]
+name = "pytest-cov"
+version = "3.0.0"
+description = "Pytest plugin for measuring coverage."
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+coverage = {version = ">=5.2.1", extras = ["toml"]}
+pytest = ">=4.6"
+
+[package.extras]
+testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
+
+[[package]]
+name = "python-dateutil"
+version = "2.8.2"
+description = "Extensions to the standard Python datetime module"
+category = "main"
+optional = true
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
+
+[package.dependencies]
+six = ">=1.5"
+
+[[package]]
+name = "python-frontmatter"
+version = "1.0.0"
+description = "Parse and manage posts with YAML (or other) frontmatter"
+category = "main"
+optional = true
+python-versions = "*"
+
+[package.dependencies]
+PyYAML = "*"
+
+[package.extras]
+docs = ["sphinx"]
+test = ["pytest", "toml", "pyaml"]
+
+[[package]]
+name = "python-slugify"
+version = "6.1.2"
+description = "A Python slugify application that also handles Unicode"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+
+[package.dependencies]
+text-unidecode = ">=1.3"
+
+[package.extras]
+unidecode = ["Unidecode (>=1.1.1)"]
+
+[[package]]
+name = "pyyaml"
+version = "6.0"
+description = "YAML parser and emitter for Python"
+category = "main"
+optional = true
+python-versions = ">=3.6"
+
+[[package]]
+name = "regex"
+version = "2022.4.24"
+description = "Alternative regular expression module, to replace re."
+category = "main"
+optional = true
+python-versions = ">=3.6"
+
+[[package]]
+name = "six"
+version = "1.16.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+
+[[package]]
+name = "text-unidecode"
+version = "1.3"
+description = "The most basic Text::Unidecode port"
+category = "main"
+optional = true
+python-versions = "*"
+
+[[package]]
+name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "main"
+optional = true
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
+[[package]]
+name = "tomli"
+version = "1.2.3"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "typing-extensions"
+version = "4.1.1"
+description = "Backported and Experimental Type Hints for Python 3.6+"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "zipp"
+version = "3.6.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+
+[extras]
+extra = ["python-frontmatter", "markdown", "regex", "python-slugify", "python-dateutil", "toml"]
+
+[metadata]
+lock-version = "1.1"
+python-versions = "^3.6"
+content-hash = "0935d97a958324d057538d2d304fdb2614cd67bf6a33c4d2d7970fa6baff5912"
+
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+    {file = "regex-2022.4.24-cp39-cp39-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:e65580ae3137bce712f505ec7c2d700aef0014a3878c4767b74aff5895fc454f"},
+    {file = "regex-2022.4.24-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:3e9e983fc8e0d4d5ded7caa5aed39ca2cf6026d7e39801ef6f0af0b1b6cd9276"},
+    {file = "regex-2022.4.24-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:cfad3a770839aa456ff9a9aa0e253d98b628d005a3ccb37da1ff9be7c84fee16"},
+    {file = "regex-2022.4.24-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:ed625205f5f26984382b68e4cbcbc08e6603c9e84c14b38457170b0cc71c823b"},
+    {file = "regex-2022.4.24-cp39-cp39-musllinux_1_1_aarch64.whl", hash = "sha256:c4fdf837666f7793a5c3cfa2f2f39f03eb6c7e92e831bc64486c2f547580c2b3"},
+    {file = "regex-2022.4.24-cp39-cp39-musllinux_1_1_i686.whl", hash = "sha256:ed26c3d2d62c6588e0dad175b8d8cc0942a638f32d07b80f92043e5d73b7db67"},
+    {file = "regex-2022.4.24-cp39-cp39-musllinux_1_1_ppc64le.whl", hash = "sha256:f89d26e50a4c7453cb8c415acd09e72fbade2610606a9c500a1e48c43210a42d"},
+    {file = "regex-2022.4.24-cp39-cp39-musllinux_1_1_s390x.whl", hash = "sha256:97af238389cb029d63d5f2d931a7e8f5954ad96e812de5faaed373b68e74df86"},
+    {file = "regex-2022.4.24-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:be392d9cd5309509175a9d7660dc17bf57084501108dbff0c5a8bfc3646048c3"},
+    {file = "regex-2022.4.24-cp39-cp39-win32.whl", hash = "sha256:bcc6f7a3a95119c3568c572ca167ada75f8319890706283b9ba59b3489c9bcb3"},
+    {file = "regex-2022.4.24-cp39-cp39-win_amd64.whl", hash = "sha256:5b9c7b6895a01204296e9523b3e12b43e013835a9de035a783907c2c1bc447f0"},
+    {file = "regex-2022.4.24.tar.gz", hash = "sha256:92183e9180c392371079262879c6532ccf55f808e6900df5d9f03c9ca8807255"},
+]
+six = [
+    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
+text-unidecode = [
+    {file = "text-unidecode-1.3.tar.gz", hash = "sha256:bad6603bb14d279193107714b288be206cac565dfa49aa5b105294dd5c4aab93"},
+    {file = "text_unidecode-1.3-py2.py3-none-any.whl", hash = "sha256:1311f10e8b895935241623731c2ba64f4c455287888b18189350b67134a822e8"},
+]
+toml = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
+tomli = [
+    {file = "tomli-1.2.3-py3-none-any.whl", hash = "sha256:e3069e4be3ead9668e21cb9b074cd948f7b3113fd9c8bba083f48247aab8b11c"},
+    {file = "tomli-1.2.3.tar.gz", hash = "sha256:05b6166bff487dc068d322585c7ea4ef78deed501cc124060e0f238e89a9231f"},
+]
+typing-extensions = [
+    {file = "typing_extensions-4.1.1-py3-none-any.whl", hash = "sha256:21c85e0fe4b9a155d0799430b0ad741cdce7e359660ccbd8b530613e8df88ce2"},
+    {file = "typing_extensions-4.1.1.tar.gz", hash = "sha256:1a9462dcc3347a79b1f1c0271fbe79e844580bb598bafa1ed208b94da3cdcd42"},
+]
+zipp = [
+    {file = "zipp-3.6.0-py3-none-any.whl", hash = "sha256:9fe5ea21568a0a70e50f273397638d39b03353731e6cbbb3fd8502a33fec40bc"},
+    {file = "zipp-3.6.0.tar.gz", hash = "sha256:71c644c5369f4a6e07636f0aa966270449561fcea2e3d6747b8d23efaa9d7832"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index 7e827a8..09b822a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.masonry.api"
 
 [tool.poetry]
 name = "liquidpy"
-version = "0.7.3"
+version = "0.7.4"
 description = "A port of liquid template engine for python"
 authors = [ "pwwang <pwwang@pwwang.com>",]
 license = "MIT"
@@ -18,14 +18,20 @@ include = "liquid"
 [tool.poetry.dependencies]
 python = "^3.6"
 jinja2 = "^3"
-python-frontmatter = {version = "^1.0.0", optional = true}
-markdown = {version = "^3.3.4", optional = true}
-regex = {version = "^2021.10.8", optional = true}
-python-slugify = {version = "^5.0.2", optional = true}
+python-frontmatter = {version = "^1.0", optional = true}
+markdown = {version = "^3.3", optional = true}
+regex = {version = "^2022.4", optional = true}
+python-slugify = {version = "^6.1", optional = true}
+python-dateutil = {version = "^2.8", optional = true}
+# needed by python-frontmatter
+toml = {version = "^0.10.2", optional = true}
 
 [tool.poetry.dev-dependencies]
-pytest = "*"
-pytest-cov = "*"
+pytest = "^7"
+pytest-cov = "^3"
+
+[tool.poetry.extras]
+extra = ["python-frontmatter", "markdown", "regex", "python-slugify", "python-dateutil", "toml"]
 
 [tool.black]
 line-length = 79
diff --git a/tests/wild/subtpl.liq b/tests/wild/subtpl.liq
new file mode 100644
index 0000000..89759ae
--- /dev/null
+++ b/tests/wild/subtpl.liq
@@ -0,0 +1 @@
+|{{ variable }}|
\ No newline at end of file
diff --git a/tests/wild/test_include.py b/tests/wild/test_include.py
new file mode 100644
index 0000000..af048fb
--- /dev/null
+++ b/tests/wild/test_include.py
@@ -0,0 +1,29 @@
+from liquid import Liquid
+from pathlib import Path
+
+def test_include(set_default_wild):
+    subtpl = Path(__file__).parent.joinpath("subtpl.liq")
+
+    # default
+    tpl = f"""
+    {{% assign variable = 8525 %}}
+    {{% include "{subtpl}" %}}
+    """
+    out = Liquid(tpl).render().strip()
+    assert out == "|8525|"
+
+    # with context
+    tpl = f"""
+    {{% assign variable = 8525 %}}
+    {{% include "{subtpl}" with context %}}
+    """
+    out = Liquid(tpl).render().strip()
+    assert out == "|8525|"
+
+    # without context
+    tpl = f"""
+    {{% assign variable = 8525 %}}
+    {{% include "{subtpl}" without context %}}
+    """
+    out = Liquid(tpl).render().strip()
+    assert out == "||"